One area where they're still sadly lacking on the wuu is voice chat. There's no universal VC, it is per-game only, and who knows if Nintendo even provides any services whatsoever for that, or if it's entirely up to game devs and publishers to provide the necessary tech and online servers to run it.
Furthermore, the wuupad has both microphone and speakers, but IIRC, you can't use those for voice chatting. This might be one area where wuu's absolutely rock bottom terrible hardware is coming back to bite Nintendo. Speculation - rampant perhaps - I know, but why wouldn't you be able to use the very hardware Nintendo built into the system for something as obvious as voice chatting? Well, the pad mic is probably fairly omnidirectional, so you'd need to do processing on the audio to make it of decent quality to send out; cancellation of other voice chatters and in-game sound effects and music for instance. Wuu's DSP just might not be up to that task, and perhaps the CPUs aren't either, although doesn't Nintendo reserve one entire CPU core - which for the most part does absolutely nothing whatsoever during gameplay other than maybe load some stuff off of the optical drive, if that's the main CPU's job rather than "Starlet II", or whatever the ARM helper core has been nicknamed this time around... Surely audio processing could be handled there, to relieve players of the need to wear a headset in addition to hold a bigass tablet
with duplicate speakers and mic built-in in their hands...
As usual, Nintendo dodges their own ineptness with the excuse "it's to protect teh kiddies", but shit, you could have toggles in the parental controls section deciding if the wee bairns are allowed to voice chat in the wuu menus, or during in-game/matches, or just in the game lobby, or not at all. C'mon people, it's not rocket science, this stuff.

*sighs*